Thirteen of the world's fifteen largest cities are on coastal plains, so they are facing the same problem as Majuro (Science Museum, 2012). For example, California, Florida, New Jersey and South Carolina are identified as four of the most vulnerable states that are easy to be affected by rising sea levels in the United States. It was shocking that when the researchers computed sea-level data and expected populations in these four states for the year 2030, they came to a conclusion that approximate 19.3 million people would be at risk of losing their hometowns because of rising sea levels in just these four areas that they studied (Discovery News, 2012). To sum up, rising sea levels, which is one of the results of global warming, is doing a great harm to humans.
Global warming also results in natural disasters; for example, storms, floods, and droughts are the effects of global warming. Although a great number of studies haven't found evidence that the number of storms is increasing because of global warming, a hurricane historian Jay Barnes stated that "Ocean heat is the key ingredient for hurricane formation, and more heat can generate more storms and more intense hurricanes." (NATIONAL GEOGRAPHIC, 2005) In addition, a new research in Nature, a famous journal, found that storms and hurricanes have become not only longer-lasting but also stronger over the past three decades. These increases correlate with the higher temperature (NATIONAL GEOGRAPHIC, 2005). It has been proven by researchers that flood is also an effect of global warming, and they found that global warming more than doubled the likelihood of floods occurring. Floods threaten humans' lives and also cost a lot of money. For example, there was a flood in the United Kingdom in 2000, which cost more than $1.7billion just in insured damages (CBCNEWS, 2011). While some portions of the world are worried about being deluged by increasing floods and storms, other regions are suffering from droughts, such as countries in Africa and the Middle East.
